fs/ntfs3: bound DeleteIndexEntryAllocation memmove length

In do_action()'s DeleteIndexEntryAllocation case, e->size comes
from an on-disk INDEX_BUFFER entry.  When e->size makes
e + e->size point past hdr + hdr->used,
PtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t
that is silently cast to a quasi-infinite size_t when passed
to memmove().  The memmove then walks past the destination
buffer.

The sibling DeleteIndexEntryRoot case at fslog.c:3540-3543
already carries the corresponding guard:

	if (PtrOffset(e1, Add2Ptr(hdr, used)) < esize ||
	    Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) ||
	    used + esize > le32_to_cpu(hdr->total)) {
		goto dirty_vol;
	}

Apply the same shape to the allocation-path case.  Also reject
esize == 0: memmove(e, e, ...) is a no-op and leaves
hdr->used unchanged, hiding a malformed entry from the
existing check_index_header() walk.

Reproduced under UML+KASAN on mainline 8d90b09e6741 by
mounting a crafted NTFS image: the unguarded memmove takes a
length of 0xffffffffffffff00 and the kernel oopses in
memmove+0x81/0x1a0 on the do_action+0x36a2 frame.

Fixes: b46acd6a6a62 ("fs/ntfs3: Add NTFS journal")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c
index 847048637dda45fb2b7778c27285044ca68e288b..2bd8754ef26d09cdc38788cef02e62ee64d71fda 100644 (file)
--- a/fs/ntfs3/fslog.c
+++ b/fs/ntfs3/fslog.c
@@ -3598,9 +3598,23 @@ move_data:
                }
 
                e1 = Add2Ptr(e, esize);
-               nsize = esize;
                used = le32_to_cpu(hdr->used);
 
+               /*
+                * Reject crafted entries whose e->size makes e + esize
+                * point past the INDEX_HDR's used boundary.  Without this,
+                * PtrOffset(e1, hdr + used) underflows to a quasi-infinite
+                * size_t when fed to the memmove() below.
+                *
+                * Also reject esize == 0: memmove(e, e, ...) is a no-op and
+                * leaves hdr->used unchanged, masking the crafted entry.
+                */
+               if (!esize || Add2Ptr(e, esize) > Add2Ptr(hdr, used) ||
+                   PtrOffset(e1, Add2Ptr(hdr, used)) < esize)
+                       goto dirty_vol;
+
+               nsize = esize;
+
                memmove(e, e1, PtrOffset(e1, Add2Ptr(hdr, used)));
 
                hdr->used = cpu_to_le32(used - nsize);